Fuel Rail Pressure Is High
Use this procedure to troubleshoot a high fuel rail pressure. Also, or use this procedure if the following code is active.
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| J1939 Code and Description | CDL Code and Description | Comment |
|---|---|---|
| 157-15
Engine Injector Metering Rail #1 Pressure : Data High – Least Severe (1) |
E396 (1)
High Fuel Rail Pressure |
The fuel rail pressure is above a threshold. |
| 157-16
Engine Injector Metering Rail #1 Pressure : High - moderate severity (2) |
E396 (2)
High Fuel Rail Pressure |
The fuel rail pressure is above a threshold. |
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| Associated Codes | ||
|---|---|---|
| J1939 Code | CDL Code | Troubleshooting Procedure |
| 157-3 | 1797-3 | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
| 157-4 | 1797-4 | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
| 1076-7 | 18-7 | Troubleshooting, "Fuel Control - Test" |
| 1440-0 | E1106 (3) | Troubleshooting, "Fuel Flow is High" |
| 1440-15 | E1106 (1) | Troubleshooting, "Fuel Flow is High" |
| 1440-16 | E1106 (2) | Troubleshooting, "Fuel Flow is High" |
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| Troubleshooting Test Steps | Values | Results |
|---|---|---|
1. Check for Codes A. Turn the keyswitch to ON. B. Connect Cat® Electronic Technician (ET) to the service tool connector. C. Turn the keyswitch to ON. D. Look for active or logged diagnostic codes. |
Codes |
Result: An associated code is present. Repair: Troubleshoot any associated codes before continuing with this test. Result: A 157-15 or E396 code is present. Proceed to Test Step 2. |
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| |
| Illustration 1 | g06085238 |
|
High-pressure fuel pump (1) Rail pressure sensor | |
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| Troubleshooting Test Steps | Values | Results |
2. Verify the Fuel Rail Pressure Sensor Reading A. Turn the keyswitch to OFF. B. Release the pressure in the high-pressure rail by loosening the end plug on one of the last two fuel accumulators. Refer to Testing and Adjusting, "Fuel Rail Pressure - Release" for instructions on how to release the pressurized fuel. C. Turn the keyswitch to ON. D. Connect Cat ET. E. Monitor the following parameter in Cat ET. - Fuel Rail Pressure Note: The fuel rail pressure sensor is not reusable. If removed, then the sensor must be replaced. |
Fuel Pressure |
Result: The "Fuel Rail Pressure" is Proceed to Test Step 3. Result: The "Fuel Rail Pressure" is greater than Repair: Vent the pressure from the fuel system. Refer to Testing and Adjusting, "Fuel Rail Pressure - Release". Replace the fuel rail pressure sensor. Proceed to Test Step 3. |
3. Check for Codes A. Remove the accumulator leak detection plugs and run a "Fuel System Functional Test" in Cat ET. B. Start the engine and operate the engine at high idle. C. Look for active or logged diagnostic codes. |
Codes |
Result: No codes present. Reinstall the accumulator leak detection plugs. Return to service. |
If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).
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